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Home / DTC / P0351 — Ignition Coil A Primary Control Circuit/Open

P0351 — Ignition Coil A Primary Control Circuit/Open

Detailed page for trouble code P0351.

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Code

P0351

Generic P — Powertrain

Ignition Coil A Primary Control Circuit/Open

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the coil primary circuit (broken conductor, broken pin)
  • Poor or corroded connector at the ignition coil or PCM
  • Blown fuse or lost constant 12V supply to coil
  • Failed ignition coil (open primary winding)
  • Short to voltage or short to ground in the primary circuit
  • Faulty PCM ignition driver

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or engine misfire (often localized to the cylinder served by coil A)
  • Reduced engine power and acceleration
  • Poor fuel economy
  • Possible hard start or no-start if coil is not firing

What to check

  • Read freeze frame and live data with a scan tool to confirm DTC and related misfire codes (e.g., P0301)
  • Visual inspection of coil, connector, wiring harness for damage, corrosion or oil contamination
  • Check fuses and battery/ignition power to coil supply circuit
  • Backprobe coil connector while cranking: verify constant 12V supply and PCM driver pulsing to ground
  • Measure primary coil resistance with DMM; compare to specification
  • Wiggle test harness/connectors while engine is running (use caution) to detect intermittent faults

Signal parameters

  • Supply voltage to coil (key ON): approximately battery voltage, typically 11–14 V (varies by vehicle)
  • Primary coil resistance: typically low — roughly 0.2–2 ohms for many modern coils (refer to vehicle spec)
  • PCM driver behavior: primary circuit is usually pulsed to ground by PCM; voltage at driver should switch between ~12 V (open) and near 0–1 V (ground) during firing
  • When using an oscilloscope: expect pulsed square/triangular waveform on primary with correct timing; absent pulses or flat line indicates open/driver fault

Diagnostic algorithm

  1. Verify DTC with a scan tool and record freeze-frame and related codes (misfire codes). Clear codes and retest to confirm recurrence.
  2. Visually inspect coil A, connector, and wiring for damage, corrosion, oil, or loose pins. Repair any obvious damage.
  3. Check relevant fuses and verify the coil’s 12V supply circuit has battery voltage with key ON.
  4. Backprobe the coil connector: with key ON/cranking verify constant power on the supply pin and check the control pin for pulsed grounding from the PCM while cranking/running.
  5. Measure primary winding resistance at the coil; compare to spec. An open (infinite) reading indicates a failed coil.
  6. Perform a continuity check from coil control pin to the PCM pin to confirm no open circuit. Check for shorts to chassis ground or battery positive.
  7. Swap coil A with a known-good coil from another cylinder (if identical). If the DTC or misfire moves with the coil, replace the coil.
  8. If wiring and coil check good and the control pin never pulses, suspect PCM driver fault. Confirm with scope and manufacturer-specific PCM tests before replacing PCM.
  9. After repairs, clear codes and road-test to confirm the fault does not return and engine runs normally.

Likely causes

  • Loose/corroded connector at the coil
  • Open or high-resistance wire between PCM and coil primary
  • Failed ignition coil primary winding
  • Blown fuse or lost 12V supply to the coil
  • PCM driver fault (less common)

Fault status

⚠️ Status
Ignition Coil A Primary Control Circuit/Open — PCM detected an open or interrupted primary/driver circuit for ignition coil A. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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P0350 P0352 P0353 P0354 P0355 P0356
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Code

P0351

GWM P — Powertrain

- Fault in primary / secondary circuit of ignition coil A

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the coil primary circuit (broken conductor, broken pin)
  • Poor or corroded connector at the ignition coil or PCM
  • Blown fuse or lost constant 12V supply to coil
  • Failed ignition coil (open primary winding)
  • Short to voltage or short to ground in the primary circuit
  • Faulty PCM ignition driver

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or engine misfire (often localized to the cylinder served by coil A)
  • Reduced engine power and acceleration
  • Poor fuel economy
  • Possible hard start or no-start if coil is not firing

What to check

  • Read freeze frame and live data with a scan tool to confirm DTC and related misfire codes (e.g., P0301)
  • Visual inspection of coil, connector, wiring harness for damage, corrosion or oil contamination
  • Check fuses and battery/ignition power to coil supply circuit
  • Backprobe coil connector while cranking: verify constant 12V supply and PCM driver pulsing to ground
  • Measure primary coil resistance with DMM; compare to specification
  • Wiggle test harness/connectors while engine is running (use caution) to detect intermittent faults

Signal parameters

  • Supply voltage to coil (key ON): approximately battery voltage, typically 11–14 V (varies by vehicle)
  • Primary coil resistance: typically low — roughly 0.2–2 ohms for many modern coils (refer to vehicle spec)
  • PCM driver behavior: primary circuit is usually pulsed to ground by PCM; voltage at driver should switch between ~12 V (open) and near 0–1 V (ground) during firing
  • When using an oscilloscope: expect pulsed square/triangular waveform on primary with correct timing; absent pulses or flat line indicates open/driver fault

Diagnostic algorithm

  1. Verify DTC with a scan tool and record freeze-frame and related codes (misfire codes). Clear codes and retest to confirm recurrence.
  2. Visually inspect coil A, connector, and wiring for damage, corrosion, oil, or loose pins. Repair any obvious damage.
  3. Check relevant fuses and verify the coil’s 12V supply circuit has battery voltage with key ON.
  4. Backprobe the coil connector: with key ON/cranking verify constant power on the supply pin and check the control pin for pulsed grounding from the PCM while cranking/running.
  5. Measure primary winding resistance at the coil; compare to spec. An open (infinite) reading indicates a failed coil.
  6. Perform a continuity check from coil control pin to the PCM pin to confirm no open circuit. Check for shorts to chassis ground or battery positive.
  7. Swap coil A with a known-good coil from another cylinder (if identical). If the DTC or misfire moves with the coil, replace the coil.
  8. If wiring and coil check good and the control pin never pulses, suspect PCM driver fault. Confirm with scope and manufacturer-specific PCM tests before replacing PCM.
  9. After repairs, clear codes and road-test to confirm the fault does not return and engine runs normally.

Likely causes

  • Loose/corroded connector at the coil
  • Open or high-resistance wire between PCM and coil primary
  • Failed ignition coil primary winding
  • Blown fuse or lost 12V supply to the coil
  • PCM driver fault (less common)

Fault status

⚠️ Status
Ignition Coil A Primary Control Circuit/Open — PCM detected an open or interrupted primary/driver circuit for ignition coil A. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0350 P0352 P0353 P0354 P0355 P0356
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Code

P0351

HUMMER P — Powertrain

Ignition Coil 1 Control Circuit

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the coil primary circuit (broken conductor, broken pin)
  • Poor or corroded connector at the ignition coil or PCM
  • Blown fuse or lost constant 12V supply to coil
  • Failed ignition coil (open primary winding)
  • Short to voltage or short to ground in the primary circuit
  • Faulty PCM ignition driver

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or engine misfire (often localized to the cylinder served by coil A)
  • Reduced engine power and acceleration
  • Poor fuel economy
  • Possible hard start or no-start if coil is not firing

What to check

  • Read freeze frame and live data with a scan tool to confirm DTC and related misfire codes (e.g., P0301)
  • Visual inspection of coil, connector, wiring harness for damage, corrosion or oil contamination
  • Check fuses and battery/ignition power to coil supply circuit
  • Backprobe coil connector while cranking: verify constant 12V supply and PCM driver pulsing to ground
  • Measure primary coil resistance with DMM; compare to specification
  • Wiggle test harness/connectors while engine is running (use caution) to detect intermittent faults

Signal parameters

  • Supply voltage to coil (key ON): approximately battery voltage, typically 11–14 V (varies by vehicle)
  • Primary coil resistance: typically low — roughly 0.2–2 ohms for many modern coils (refer to vehicle spec)
  • PCM driver behavior: primary circuit is usually pulsed to ground by PCM; voltage at driver should switch between ~12 V (open) and near 0–1 V (ground) during firing
  • When using an oscilloscope: expect pulsed square/triangular waveform on primary with correct timing; absent pulses or flat line indicates open/driver fault

Diagnostic algorithm

  1. Verify DTC with a scan tool and record freeze-frame and related codes (misfire codes). Clear codes and retest to confirm recurrence.
  2. Visually inspect coil A, connector, and wiring for damage, corrosion, oil, or loose pins. Repair any obvious damage.
  3. Check relevant fuses and verify the coil’s 12V supply circuit has battery voltage with key ON.
  4. Backprobe the coil connector: with key ON/cranking verify constant power on the supply pin and check the control pin for pulsed grounding from the PCM while cranking/running.
  5. Measure primary winding resistance at the coil; compare to spec. An open (infinite) reading indicates a failed coil.
  6. Perform a continuity check from coil control pin to the PCM pin to confirm no open circuit. Check for shorts to chassis ground or battery positive.
  7. Swap coil A with a known-good coil from another cylinder (if identical). If the DTC or misfire moves with the coil, replace the coil.
  8. If wiring and coil check good and the control pin never pulses, suspect PCM driver fault. Confirm with scope and manufacturer-specific PCM tests before replacing PCM.
  9. After repairs, clear codes and road-test to confirm the fault does not return and engine runs normally.

Likely causes

  • Loose/corroded connector at the coil
  • Open or high-resistance wire between PCM and coil primary
  • Failed ignition coil primary winding
  • Blown fuse or lost 12V supply to the coil
  • PCM driver fault (less common)

Fault status

⚠️ Status
Ignition Coil A Primary Control Circuit/Open — PCM detected an open or interrupted primary/driver circuit for ignition coil A. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0350 P0352 P0353 P0354 P0355 P0356
Repair manuals

Manual library for HUMMER

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HUMMER

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Code

P0351

LAND ROVER P — Powertrain

Ignition Malfunction of the primary/secondary circuit of the coil A

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the coil primary circuit (broken conductor, broken pin)
  • Poor or corroded connector at the ignition coil or PCM
  • Blown fuse or lost constant 12V supply to coil
  • Failed ignition coil (open primary winding)
  • Short to voltage or short to ground in the primary circuit
  • Faulty PCM ignition driver

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or engine misfire (often localized to the cylinder served by coil A)
  • Reduced engine power and acceleration
  • Poor fuel economy
  • Possible hard start or no-start if coil is not firing

What to check

  • Read freeze frame and live data with a scan tool to confirm DTC and related misfire codes (e.g., P0301)
  • Visual inspection of coil, connector, wiring harness for damage, corrosion or oil contamination
  • Check fuses and battery/ignition power to coil supply circuit
  • Backprobe coil connector while cranking: verify constant 12V supply and PCM driver pulsing to ground
  • Measure primary coil resistance with DMM; compare to specification
  • Wiggle test harness/connectors while engine is running (use caution) to detect intermittent faults

Signal parameters

  • Supply voltage to coil (key ON): approximately battery voltage, typically 11–14 V (varies by vehicle)
  • Primary coil resistance: typically low — roughly 0.2–2 ohms for many modern coils (refer to vehicle spec)
  • PCM driver behavior: primary circuit is usually pulsed to ground by PCM; voltage at driver should switch between ~12 V (open) and near 0–1 V (ground) during firing
  • When using an oscilloscope: expect pulsed square/triangular waveform on primary with correct timing; absent pulses or flat line indicates open/driver fault

Diagnostic algorithm

  1. Verify DTC with a scan tool and record freeze-frame and related codes (misfire codes). Clear codes and retest to confirm recurrence.
  2. Visually inspect coil A, connector, and wiring for damage, corrosion, oil, or loose pins. Repair any obvious damage.
  3. Check relevant fuses and verify the coil’s 12V supply circuit has battery voltage with key ON.
  4. Backprobe the coil connector: with key ON/cranking verify constant power on the supply pin and check the control pin for pulsed grounding from the PCM while cranking/running.
  5. Measure primary winding resistance at the coil; compare to spec. An open (infinite) reading indicates a failed coil.
  6. Perform a continuity check from coil control pin to the PCM pin to confirm no open circuit. Check for shorts to chassis ground or battery positive.
  7. Swap coil A with a known-good coil from another cylinder (if identical). If the DTC or misfire moves with the coil, replace the coil.
  8. If wiring and coil check good and the control pin never pulses, suspect PCM driver fault. Confirm with scope and manufacturer-specific PCM tests before replacing PCM.
  9. After repairs, clear codes and road-test to confirm the fault does not return and engine runs normally.

Likely causes

  • Loose/corroded connector at the coil
  • Open or high-resistance wire between PCM and coil primary
  • Failed ignition coil primary winding
  • Blown fuse or lost 12V supply to the coil
  • PCM driver fault (less common)

Fault status

⚠️ Status
Ignition Coil A Primary Control Circuit/Open — PCM detected an open or interrupted primary/driver circuit for ignition coil A. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0350 P0352 P0353 P0354 P0355 P0356
274

Browse 274 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0351

SEAT P — Powertrain

Ignition - faulty

Brand: SEAT
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in the coil primary circuit (broken conductor, broken pin)
  • Poor or corroded connector at the ignition coil or PCM
  • Blown fuse or lost constant 12V supply to coil
  • Failed ignition coil (open primary winding)
  • Short to voltage or short to ground in the primary circuit
  • Faulty PCM ignition driver

Symptoms

  • Malfunction indicator lamp (MIL) illuminated
  • Rough idle or engine misfire (often localized to the cylinder served by coil A)
  • Reduced engine power and acceleration
  • Poor fuel economy
  • Possible hard start or no-start if coil is not firing

What to check

  • Read freeze frame and live data with a scan tool to confirm DTC and related misfire codes (e.g., P0301)
  • Visual inspection of coil, connector, wiring harness for damage, corrosion or oil contamination
  • Check fuses and battery/ignition power to coil supply circuit
  • Backprobe coil connector while cranking: verify constant 12V supply and PCM driver pulsing to ground
  • Measure primary coil resistance with DMM; compare to specification
  • Wiggle test harness/connectors while engine is running (use caution) to detect intermittent faults

Signal parameters

  • Supply voltage to coil (key ON): approximately battery voltage, typically 11–14 V (varies by vehicle)
  • Primary coil resistance: typically low — roughly 0.2–2 ohms for many modern coils (refer to vehicle spec)
  • PCM driver behavior: primary circuit is usually pulsed to ground by PCM; voltage at driver should switch between ~12 V (open) and near 0–1 V (ground) during firing
  • When using an oscilloscope: expect pulsed square/triangular waveform on primary with correct timing; absent pulses or flat line indicates open/driver fault

Diagnostic algorithm

  1. Verify DTC with a scan tool and record freeze-frame and related codes (misfire codes). Clear codes and retest to confirm recurrence.
  2. Visually inspect coil A, connector, and wiring for damage, corrosion, oil, or loose pins. Repair any obvious damage.
  3. Check relevant fuses and verify the coil’s 12V supply circuit has battery voltage with key ON.
  4. Backprobe the coil connector: with key ON/cranking verify constant power on the supply pin and check the control pin for pulsed grounding from the PCM while cranking/running.
  5. Measure primary winding resistance at the coil; compare to spec. An open (infinite) reading indicates a failed coil.
  6. Perform a continuity check from coil control pin to the PCM pin to confirm no open circuit. Check for shorts to chassis ground or battery positive.
  7. Swap coil A with a known-good coil from another cylinder (if identical). If the DTC or misfire moves with the coil, replace the coil.
  8. If wiring and coil check good and the control pin never pulses, suspect PCM driver fault. Confirm with scope and manufacturer-specific PCM tests before replacing PCM.
  9. After repairs, clear codes and road-test to confirm the fault does not return and engine runs normally.

Likely causes

  • Loose/corroded connector at the coil
  • Open or high-resistance wire between PCM and coil primary
  • Failed ignition coil primary winding
  • Blown fuse or lost 12V supply to the coil
  • PCM driver fault (less common)

Fault status

⚠️ Status
Ignition Coil A Primary Control Circuit/Open — PCM detected an open or interrupted primary/driver circuit for ignition coil A. Check coil, connector, wiring, power/ground and PCM driver.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P0350 P0352 P0353 P0354 P0355 P0356
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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